Sport Supply, Inc. (“Sport Supply”) appeals the district court’s grant of summary judgment in favor of Columbia Casualty Company (“Columbia”) and RSKCo Claims Service, Inc. (“RSKCo”). Sport Supply filed suit against Columbia, alleging that the insurer was required to reimburse Sport Supply for part of the cost of defending a counterclaim brought by Mac-Mark Corporation (“MacMark”). Sport Supply contended that MacMark’s allegations of trademark infringement fell under the provisions of the insurance policy relating to “advertising injury.”, Sport Supply also filed suit - against RSKCo, the loss adjusting company that it had retained pursuant to the insurance agreement, asserting various state law claims. Sport Supply alleged that RSKCo was largely *456 responsible for Columbia’s failure to provide coverage in this case. Because we conclude that Sport Supply was not entitled to coverage under the insurance policy, we affirm the district court’s judgment in favor of Columbia and RSKCo.
I
The origins of the instant case can be found in the dispute between Sport Supply and MacMark. MacMark entered a licensing agreement with Sport Supply, which permitted Sport Supply to use MacMark’s “Macgregor” trademark on certain sporting goods. MacMark later accused Sport Supply of breaching that licensing agreement by attempting to sell products bearing the Macgregor trademark on the Internet. MacMark eventually sent a letter to Sport Supply, stating that it planned to terminate the licensing agreement. In response, Sport Supply brought an action in Texas state court, seeking a declaration that it was not in breach of the agreement. MacMark filed a counterclaim, which alleged in relevant part that Sport Supply had breached the licensing agreement by advertising, offering to sell, and selling products with the Macgregor trademark on the Internet. 1
Sport Supply and MacMark eventually settled their dispute. Sport Supply was not required to pay any compensation to MacMark, but, according to Sport Supply, it spent a considerable amount of money defending MacMark’s counterclaim. Sport Supply therefore requested that Columbia, its insurer, pay, part of Sport Supply’s defense costs. Columbia responded that Sport Supply was not entitled to coverage.
Sport Supply subsequently brought the instant action against Columbia in Texas state court, seeking to recoup those defense costs. Sport Supply also filed .suit against RSKCo, raising numerous state law claims. The case was removed to the federal district court for the Northern District of Texas, which had diversity jurisdiction over the dispute. The district court granted the defendants’ motions for summary judgment. Sport Supply now appeals.
II
We review the district court’s ruling on a motion for summary judgment
de novo,
applying the same legal standard as the district court.
Wyatt v. Hunt Plywood Co.,
In determining whether there is a dispute as to any material fact, we consider all of the evidence in the record, but we do not make credibility determinations or weigh the evidence.
Reeves v. Sanderson Plumbing Prods., Inc.,
Sport Supply has requested that Columbia reimburse it for part of the cost of defending MacMark’s counterclaim. Thus, this case involves the “duty to defend.”
See Pa. Pulp & Paper Co. v. Nationwide Mut. Ins. Co.,
This case turns on whether the insurance policy that Columbia issued to Sport Supply covers MacMark’s counterclaim. 3 The parties appear to agree that MacMark alleged facts to support a claim of trademark infringement. Sport Supply insists that MacMark’s trademark infringement claim is covered by the “advertising injury” provisions of the policy. The policy covers “ ‘[advertising injury’ caused by an offense committed in the course of advertising [Sport Supply’s] goods, products, or services[.]” In the policy, “[advertising injury” is defined as an injury “arising out of’ one or more of the following offenses:
a. Oral or written publication of material that slanders or libels a person or organization or disparages a person’s or organization’s goods, products, or services;
b. Oral or written publication of material that violates a person’s right of privacy;
c. Misappropriation of advertising ideas or style of doing business; or
d. Infringement of copyright, title or slogan.
Sport Supply contends that trademark infringement constitutes either the “[m]isap-propriation of advertising ideas” or the “[i]nfringement of copyright, title or slogan.” Therefore, Sport Supply asserts, *458 MacMark’s trademark infringement claim is covered by the policy.
Columbia responds that, regardless whether trademark infringement can be deemed an “advertising injury,” Sport Supply is not entitled to insurance benefits; Columbia asserts that one of the policy exclusions applies to negate coverage. The policy specifically excludes coverage for “ ‘[advertising injury1 arising out of ... [bjreach of contract, other than misappropriation of advertising ideas under an implied contract[.]” Columbia contends that MacMark’s alleged “advertising injury” arose out of Sport Supply’s breach of its licensing agreement with MacMark. We agree. 4
Under Texas law, when an exclusion prevents coverage for injuries “arising out of’ particular conduct, “[a] claim need only bear an
incidental relationship
to the described conduct for the exclusion to apply.”
Scottsdale Ins. Co. v. Tex. Sec. Concepts & Investigation,
The exclusion does, however, provide an exception for “misappropriation of advertising ideas under an implied contract[.]” In order to complete the analysis required in duty to defend cases, we examine whether this exception to the breach of contract exclusion could apply in this case.
Cf. Pilgrim Enters., Inc. v. Maryland Cas. Co.,
Courts have differed considerably' over whether trademark infringement constitutes the “misappropriation of advertising ideas.”
Compare Callas Enters.,
Any cogent analysis of this issue (whether trademark infringement constitutes the
*460
“misappropriation of advertising ideas”) should begin with a review of the essential underpinnings of trademark law. A trademark is a word, name, or symbol that is intended to distinguish one producer’s goods from those of other producers.
See
15 U.S.C. § 1127 (defining a “trademark” as “any word, name, symbol, or device, or any combination thereof’ that is used by a person “to identify and distinguish his or her goods ... and to indicate the source of the goods”). Trademark law helps ensure that a trademark can serve this function of distinguishing a producer’s goods, because it prohibits other producers from using a similar mark in a way that is “likely to cause confusion” among consumers
(ie.,
by making consumers wonder which producers created which products).
See
15 U.S.C. § 1125(a)(1)(A);
Moseley v. v. Secret Catalogue, Inc.,
Trademark law thereby serves two essential functions. First, it aids consumers by assuring them that products with the same trademark come from the same source.
See Qualitex Co. v. Jacobson Prods. Co.,
A trademark can serve these two purposes, however, only to the extent that it distinguishes a producer’s goods.
See id.
at 164,
Significantly for the purposes of this case, Texas law appears to have adopted this understanding of a trademark. Under Texas law, a trademark is a device intended primarily to identify and distinguish a particular producer’s goods.
See
Tex. Bus. & Com. Code Ann. § 16.01(a)(5) (defining a “trademark” as “a word, name, symbol, device, slogan or any combination thereof ... used by a person
to identify his goods and distinguish them
from the goods manufactured or sold by others”) (emphasis added);
Horseshoe Bay Resort Sales Co. v. Lake Lyndon B. Johnson Improvement Corp.,
This understanding of the function of a “trademark” under both federal law and Texas state law (as a label that identifies and distinguishes a product) enables us to evaluate whether Sport Supply’s alleged trademark infringement could qualify as the “misappropriation of [an] advertising idea[ ].”
In order to understand the meaning of the phrase “misappropriation of advertising ideas,” we analyze the individual terms in the phrase. The term “misappropriation” is ordinarily understood as the
*462
unlawful taking or use of another person’s property.
See
Webster’s Third New Int’l Dictionary 1442 (1993) (defining “misappropriate” as “to apply to illegal purposes” and “to appropriate dishonestly for one’s own use”); BlaCK’s Law Dictionary 998 (6th ed.1990) (defining “[m]isappropriation” as “[t]he unauthorized, improper, or unlawful use of funds or other property for purpose other than that for which intended”). A trademark is a type of property.
See Coll. Sav. Bank v. Fla. Prepaid Postsecondary Educ. Expense. Bd.,
The Texas Supreme Court, in another context, adopted the following definition of “advertise”:
To advise, announce, apprise, command, give notice of, inform, make known, publish. On [ (sic.) ] call to the public attention by any means whatsoever. Any oral, written, or graphic statement made by the seller in any manner in connection with the solicitation of business and includes, without limitation because of enumeration, statements and representations made in a newspaper or other publication or on radio or television or contained in any notice, handbill, sign, catalog, or letter, or printed on or contained in any tag or label attached to or accompanying any merchandise.
Smith v. Baldwin,
The Texas Supreme Court’s definition of “advertising” would seem to accord with our common understanding of the term as referring to a device for the solicitation of business.
See Frog, Switch & Mfg. Co. v.
*463
Travelers Ins. Co.,
Based on that understanding of “advertising,” the Macgregor trademark would not appear to constitute “advertising.” The Macgregor mark, like most trademarks, is a
label
that serves primarily to
identify and distinguish
certain Mac-Mark products. The Macgregor label would not, by itself, appear to serve as a “marketing deviee[] designed to induce the public to patronize” establishments with Macgregor products. Thus, the Macgregor trademark would not, standing alone, appear to be “advertising.”
Cf. Hugo Boss Fashions, Inc. v. Fed. Ins. Co.,
Despite this intuitive sense that names and labels of products are not, in and of themselves, advertising, several courts have suggested that a trademark is
inherently
“advertising.”
See, e.g.,Am. Employers’ Ins. Co. v. DeLorme Publ’g Co.,
These courts appear to have adopted a very broad (and abstract) definition of “advertising.” It is true that, from a theoretical standpoint, any trademark could serve as “advertising.” See 1 J. Thomas McCarthy, MCCARTHY On TRADEMARKS AND UNFAIR Competition § 3-2 (4th ed.1996) (observing that a trademark can serve, in part, “[a]s a prime instrument in advertising and selling ... goods”); see also Ralph S. Brown, Jr., Advertising and the Public Interest: *464 Legal Protection of Trade Symbols, 57 Yale L.J. 1165, 1166, 1185 (1948) (describing “[t]rade symbols,” which include trademarks and trade names, as a “species of advertising”). Once consumers become familiar with a particular product label, they may be induced to buy other products with the same label, not because they have seen the other products “advertised” in any conventional sense, but because the products carry the familiar label. See Frank I. Schechter, The Rational Basis of Trademark Protection, 40 HaRV. L. Rev. 813, 819 (1927) (“[T]he trademark is ... often the most effective agent for the creation of good will, imprinting upon the public mind an anonymous and impersonal guarantee of satisfaction, creating a desire for further satisfactions. The mark actually sells the goods.”) (emphasis in original). For example, a patron of Macgregor golf clubs might be induced to purchase Macgregor soccer equipment simply because the latter contains the label “Macgregor.” In that way, the Macgregor label would serve to “advertise” Macgregor products. 10 •
Thus, as a theoretical matter, any trademark could constitute “advertising.” That does not mean, however, that any trademark constitutes “advertising”' under the terms of this insurance policy. We must remember that our mission, in interpreting this insurance policy, is not to consider all possible definitions of the policy terms. Instead, in a diversity case such as the present one, we must apply the law of the forum state. Thus, our task is to examine whether, under Texas law, this trademark constitutes “advertising.”
Under Texas law, it appears that the term “advertising” in an insurance policy is used in a conventional sense: to refer to a public announcement (such as on a billboard, in a newspaper, on a signpost, or in a television or radio commercial) that “induee[s] the public to patronize” a particular establishment or to buy a particular product. In other words, the term “advertising” refers to a common device for soliciting business. 11 As we have seen, Texas law does not appear to view a trademark as a marketing device. Texas law has adopted the more conventional understanding of a trademark as a label that serves primarily to identify and distinguish products. 12 Thus, under Texas law, *465 the Macgregor trademark would not appear to be “advertising.” It follows that the idea for the Macgregor tradermark is not an “advertising idea,” and that the infringement of the Macgregor trademark could not be seen as the “misappropriation of [an] advertising idea[ ].”
Thus, even under the “broadest reading” of the phrase “misappropriation of advertising ideas” as “the ... wrongful ] tak[ing of] an idea about the solicitation of business,”
Frog, Switch,
Ill
Sport Supply also asserts several claims against RKSCo, the loss adjusting company that Sport Supply retained to assist it in filing insurance claims. Sport Supply’s allegations against RSKCo relate to the “notice” provisions of the insurance policy issued by Columbia. Columbia originally denied Sport Supply’s coverage claim based on its conclusion that Sport Supply had foiled to notify the insurance company of MacMark’s counterclaim in a timely manner. Sport Supply alleges that, under a contract that it had with RSKCo, it was in fact RSKCo’s responsibility to promptly notify Columbia about the dispute with MacMark. Sport Supply appears to assert that RSKCo’s failure to perform this duty caused Columbia to deny coverage to Sport Supply.
First, Sport Supply contends that RSKCo breached a contract with Sport Supply by failing to notify Columbia about MacMark’s counterclaim. Under Texas law, the elements of a breach of contract claim are (1) the existence of a valid contract; (2) performance by the plaintiff; (3) breach of the contract by the defendant; and (4) damages sustained by the plaintiff as a result of the breach.
Renteria v. Trevino,
Second, Sport Supply alleges that RSKCo was negligent for failing to report the MacMark counterclaim to Columbia in a timely manner. Under Texas law, the elements of a negligence claim are (1) a legal duty on the part of the defendant; (2) breach of that duty; and (3) damages proximately resulting from that breach.
Van Horn v. Chambers,
For the above reasons, the judgment of the district court is AFFIRMED.
Notes
. According to MacMark, Sport Supply's Internet sales violated the agreement "in nu- ■ merous ways.” First of all, the licensing agreement did not give Sport Supply the authority to use the Macgregor trademark on the Internet. Second, the agreement permitted Sport Supply to advertise and sell Macgregor products only in the United States, Canada, and Mexico (and Internet sales are necessarily worldwide). Third, the licensing agreement permitted Sport Supply to sell products with the Macgregor label only to institutional customers and, by advertising and selling Macgregor products on the Internet, Sport Supply was offering those products to non-institutional customers.
. Because a court can examine only the four corners of the complaint and the four corners of the insurance policy, this approach is often described as "the eight comers rule.”
Tex. Med. Liab. Trust v. Zurich Ins. Co.,
. Sport Supply contends that we need not reach the merits of this case. According to Sport Supply, we can reverse the district court’s judgment in favor of Columbia based on the insurance company’s failure to offer valid summary judgment evidence. Sport Supply argues that the insurance policy that Columbia presented to the district court constituted invalid evidence because Columbia did not provide a complete copy of the policy. Sport Supply’s argument lacks merit. Even if the district court erred in admitting the policy into evidence, we will not reverse the district court’s evidentiary ruling unless Sport Supply can show it was prejudiced by that decision.
See Viazis v. Am. Ass’n of Orthodontists,
. We reject Sport Supply's assertion that the principle of collateral estoppel applies to prevent Columbia from claiming that Sport Supply is not entitled to coverage in this case. Sport Supply argues that estoppel applies because of a previous action between Sport Supply and Columbia involving identical policy language. In the underlying case, Sport Supply had breached a licensing agreement with Pizza Hut by improperly using the Pizza Hut trademark. In an unpublished opinion, the magistrate judge apparently commented that Pizza Hut's claim of trademark infringement was covered by the "advertising injury” provisions of the policy. The magistrate judge also found that the breach of contract exclusion did not apply. Sport Supply contends that Columbia is bound by these determinations.
We have stated that collateral estoppel is appropriate only when the following four conditions are met. First, the issue in the subsequent action must be identical to the issue litigated in the prior action. Second, the issue must have been fully and vigorously litigated in the prior action. Third, the issue must have been necessary to support the judgment in the previous case. Fourth, there must be no special circumstances that would render preclusion inappropriate or unfair.
Gandy Nursery, Inc. v. United States,
. The meaning of the additional language "under an implied contract” is unclear. We have been unable to locate any Texas state case or any federal case that analyzes the meaning of this phrase in a similar insurance policy. Fortunately, we need not parse the meaning of this phrase. As discussed below, we conclude that Sport Supply’s alleged infringement of the Macgregor trademark does not constitute the “misappropriation of [an] advertising idea[].” Based on that determination, we conclude that the exception to the breach of contract exclusion does not apply. In other words, we hold that the exclusion does apply to negate coverage.
. In these cases, the courts examined insurance policies that were identical to the policy in the present case.
See Callas Enters.,
. Perhaps for that reason, a particular “mark” qualifies for trademark protection only to the extent that it distinguishes a product. The law classifies marks into five different categories: (1) generic; (2) descriptive; (3) suggestive; (4) arbitrary; or (5) fanciful.
Two Pesos, Inc. v. Taco Cabana, Inc.,
Suggestive, arbitrary, and fanciful marks, by contrast, better distinguish their products and are therefore accorded more protection under trademark law.
See id.
at 768,
The underlying action in the instant case involved the alleged infringement of “Macgre-gor,” a trademark associated with various sporting goods. The word "Macgregor” is not a generic term for sporting equipment, nor does it describe (or even suggest) any qualities or characteristics of sporting goods. Therefore, it seems clear that the "Macgre-gor” trademark is either an "arbitrary” or "fanciful” trademark that, because of its inherent distinctiveness, would be accorded the utmost protection under trademark law.
See Two Pesos,
. We decline to adopt the Sixth Circuit's more limited definition of the term "misappropriation.” The Sixth Circuit, in analyzing an identical insurance policy, determined that trademark infringement can never constitute "advertising injury.”
See Advance Watch,
. One federal district court, in concluding that trademark and trade dress infringement constitute advertising activities, commented that "[t]he Texas Supreme Court has adopted a very broad definition of advertising.”
Bay Elec.,
.Justice Frankfurter eloquently elucidated this abstract understanding of a trademark as a type of marketing tool:
The protection of trade-marks is the law’s recognition of the psychological function of symbols. If it is true that we live by symbols, it is no less true that we purchase goods by them. A trade-mark is a merchandising short-cut which induces a purchaser to select what he wants, or what he has been led to believe he wants. The owner of a mark exploits this human propensity by making every effort to impregnate the atmosphere of the market with the drawing power of a congenial symbol. Whatever the means employed, the aim is the same — to convey through the mark, in the minds of potential customers, the desirability of the commodity upon which it appears. Once this is attained, the trademark owner has something of value. If another poaches upon the commercial magnetism of the symbol he has created, the owner can obtain legal redress.
Mishawaka Rubber & Woolen Mfg. Co.,
. We note that our interpretation of "advertising” accords with Texas’s general rule that terms in an insurance policy "are to be given their ordinary and generally accepted mean-hig[.]”
Canutillo,
. As a result, under Texas law (as under federal law), a mark is protected to the extent that it serves to
distinguish
a particular product, not to the extent that it
entices
consumers to purchase the product.
See Two Pesos,
. Because we conclude that the breach of contract exclusion applies in this case, we do not address Columbia's additional arguments as to why Sport Supply is not entitled to coverage.
. We decline to consider Sport Supply’s assertion that RSKCo violated Article 21.21 of the Texas Insurance Code.
See
Tex. Ins. Code Ann. art. 21.21 § 4 (listing various “unfair methods of competition and unfair and deceptive acts or practices in the business of insurance”). Sport Supply alleges (1) that RSKCo misrepresented the extent to which it was responsible for reporting potential claims to Columbia; and (2) that RSKCo failed to promptly disclose its determination that Mac-Mark's counterclaim was not covered by the policy. Sport Supply fails to support these allegations with any legal argument. Therefore, we need not consider these contentions.
See
Fed. R. App.P.28(a)(9)(A);
Kane Enters. v. MacGregor (USA) Inc.,
